I mentioned in the comments I posted earlier I could send data on how to do this stuff, well here it is!

https://docs.unrealengine.com/latest/INT/Engine/Animation/AnimationRetargeting/

https://docs.unrealengine.com/latest/INT/Engine/Animation/AnimHowTo/Retargeting/

https://docs.unrealengine.com/latest/INT/Engine/Animation/RetargetingDifferentSkeletons/

And here is a video posted by the official Unreal Engine youtube channel showing the process for different skeletons, which would be the case of relevance for using animations from some of the newer and higher quality dinos Wildcard has pushed out such as Yutyrannus and even Megalosaurus to an extent(maybe make the JP rex use the Megalo sleep animation(y'know the one where it is curled in a little ball and looks freaking adorable!) when it is knocked-out and the wake-up animation used as the, well, wake-up animation. IMHO The Rex curling up to sleep when hit with tranq darts is more realistic/immersive/badass as it is so massive that when you bombard it with Tranqs it can take its time to get comfy for a nap before losing all awareness. XP

https://www.youtube.com/watch?v=xy9aLbZLdeA

I will be delving into the devkit when I have time, if the update has dropped(updated Devkit several days after the last big patch dropped so I have no idea if the updates I had included the new content or only prior updates I missed), to try and find ideal animations from Megalosaurus&Yutyrannus that are far better than what the Vanilla Rex has going for it.

Oh and a quick note: To use animations from Yuty and Megalo you need to set up 2 'Rigs'(see topics and video) ; one that is Yuty-JP Rex and one that is Megalo-JP rex, if I am not mistaken.

You have already tweaked the stats so I will just quickly say a neat idea.

Yutyrannus' entire gimmick is the fear/courage roar, so unlike other players I do not think Rex should have this feature as well as it makes Yuty relevant at all. I do think however, that the roar your JP Rex makes should have the knockback effect like Yuty's roar/Wyvern gale wings has along with a very short duration slow ailment(3 seconds-ish) to those affected by the roar. So no 'fear/courage'... but more of a crowd control to make 'dem pesky Raptors screw off.